Enhancing ferroelectric photovoltaic effect by polar order engineering
Ferroelectric materials for photovoltaics have sparked great interest because of their switchable photoelectric responses and above-bandgap photovoltages that violate conventional photovoltaic theory. However, their relatively low photocurrent and power conversion efficiency limit their potential ap...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2018
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/88147 http://hdl.handle.net/10220/45647 |
| _version_ | 1811694199185080320 |
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| author | You, Lu Zheng, Fan Fang, Liang Zhou, Yang Tan, Liang Z. Zhang, Zeyu Ma, Guohong Schmidt, Daniel Rusydi, Andrivo Wang, Le Chang, Lei Rappe, Andrew M. Wang, Junling |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering You, Lu Zheng, Fan Fang, Liang Zhou, Yang Tan, Liang Z. Zhang, Zeyu Ma, Guohong Schmidt, Daniel Rusydi, Andrivo Wang, Le Chang, Lei Rappe, Andrew M. Wang, Junling |
| author_sort | You, Lu |
| collection | NTU |
| description | Ferroelectric materials for photovoltaics have sparked great interest because of their switchable photoelectric responses and above-bandgap photovoltages that violate conventional photovoltaic theory. However, their relatively low photocurrent and power conversion efficiency limit their potential application in solar cells. To improve performance, conventional strategies focus mainly on narrowing the bandgap to better match the solar spectrum, leaving the fundamental connection between polar order and photovoltaic effect largely overlooked. We report large photovoltaic enhancement by A-site substitutions in a model ferroelectric photovoltaic material, BiFeO3. As revealed by optical measurements and supported by theoretical calculations, the enhancement is accompanied by the chemically driven rotational instability of the polarization, which, in turn, affects the charge transfer at the band edges and drives a direct-to-indirect bandgap transition, highlighting the strong coupling between polarization, lattice, and orbital order parameters in ferroelectrics. Polar order engineering thus provides an additional degree of freedom to further boost photovoltaic efficiency in ferroelectrics and related materials. |
| first_indexed | 2024-10-01T07:03:46Z |
| format | Journal Article |
| id | ntu-10356/88147 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:03:46Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/881472023-07-14T15:51:49Z Enhancing ferroelectric photovoltaic effect by polar order engineering You, Lu Zheng, Fan Fang, Liang Zhou, Yang Tan, Liang Z. Zhang, Zeyu Ma, Guohong Schmidt, Daniel Rusydi, Andrivo Wang, Le Chang, Lei Rappe, Andrew M. Wang, Junling School of Materials Science & Engineering DRNTU::Engineering::Materials Ferroelectric Photovoltaic Effect Ferroelectric materials for photovoltaics have sparked great interest because of their switchable photoelectric responses and above-bandgap photovoltages that violate conventional photovoltaic theory. However, their relatively low photocurrent and power conversion efficiency limit their potential application in solar cells. To improve performance, conventional strategies focus mainly on narrowing the bandgap to better match the solar spectrum, leaving the fundamental connection between polar order and photovoltaic effect largely overlooked. We report large photovoltaic enhancement by A-site substitutions in a model ferroelectric photovoltaic material, BiFeO3. As revealed by optical measurements and supported by theoretical calculations, the enhancement is accompanied by the chemically driven rotational instability of the polarization, which, in turn, affects the charge transfer at the band edges and drives a direct-to-indirect bandgap transition, highlighting the strong coupling between polarization, lattice, and orbital order parameters in ferroelectrics. Polar order engineering thus provides an additional degree of freedom to further boost photovoltaic efficiency in ferroelectrics and related materials. MOE (Min. of Education, S’pore) Published version 2018-08-23T04:45:24Z 2019-12-06T16:57:04Z 2018-08-23T04:45:24Z 2019-12-06T16:57:04Z 2018 Journal Article You, L., Zheng, F., Fang, L., Zhou, Y., Tan, L. Z., Zhang, Z., . . . Wang, J. (2018). Enhancing ferroelectric photovoltaic effect by polar order engineering. Science Advances, 4(7), eaat3438-. doi:10.1126/sciadv.aat3438 https://hdl.handle.net/10356/88147 http://hdl.handle.net/10220/45647 10.1126/sciadv.aat3438 en Science Advances © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). 10 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Materials Ferroelectric Photovoltaic Effect You, Lu Zheng, Fan Fang, Liang Zhou, Yang Tan, Liang Z. Zhang, Zeyu Ma, Guohong Schmidt, Daniel Rusydi, Andrivo Wang, Le Chang, Lei Rappe, Andrew M. Wang, Junling Enhancing ferroelectric photovoltaic effect by polar order engineering |
| title | Enhancing ferroelectric photovoltaic effect by polar order engineering |
| title_full | Enhancing ferroelectric photovoltaic effect by polar order engineering |
| title_fullStr | Enhancing ferroelectric photovoltaic effect by polar order engineering |
| title_full_unstemmed | Enhancing ferroelectric photovoltaic effect by polar order engineering |
| title_short | Enhancing ferroelectric photovoltaic effect by polar order engineering |
| title_sort | enhancing ferroelectric photovoltaic effect by polar order engineering |
| topic | DRNTU::Engineering::Materials Ferroelectric Photovoltaic Effect |
| url | https://hdl.handle.net/10356/88147 http://hdl.handle.net/10220/45647 |
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